6. The Union Operator Profile DTD


                 <!--
                   DTD for Union Operator, Draft of 9/9/99

                     (c) 1998-99 Invisible Worlds, Inc.

                   -->

                 <!ENTITY % TEXT       "#PCDATA">
                 <!ENTITY % NAME       "NMTOKEN">
                 <!ENTITY % TYPE       "NMTOKEN">
                 <!ENTITY % ATEXT      "CDATA">


                 <!ELEMENT union       (intersect+)>
                 <!ELEMENT intersect   ((union|compare)+)>
                 <!ELEMENT compare     (path, value)>
                 <!ATTLIST compare
                           subtree     %NAME;             #REQUIRED
                           operator    (eq|ne|contains|excludes)
                                                          "eq"
                           caseSensitive
                                       (true|false)       "true">
                 <!ELEMENT path        (element*)>
                 <!ATTLIST path
                           attribute   %ATEXT;            "">
                 <!ELEMENT element     EMPTY>
                 <!ATTLIST element
                           property    %TYPE;             #REQUIRED>
                 <!ELEMENT value       (%TEXT;)>